27771656212 has 12 divisors (see below), whose sum is σ = 51459245460. Its totient is φ = 13069014656.

The previous prime is 27771656173. The next prime is 27771656219. The reversal of 27771656212 is 21265617772.

It can be written as a sum of positive squares in 2 ways, for example, as 18019303696 + 9752352516 = 134236^2 + 98754^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27771656219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204203287 + ... + 204203422.

It is an arithmetic number, because the mean of its divisors is an integer number (4288270455).

Almost surely, 2^27771656212 is an apocalyptic number.

It is an amenable number.

27771656212 is a deficient number, since it is larger than the sum of its proper divisors (23687589248).

27771656212 is a wasteful number, since it uses less digits than its factorization.

27771656212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408406730 (or 408406728 counting only the distinct ones).

The product of its digits is 493920, while the sum is 46.

The spelling of 27771656212 in words is "twenty-seven billion, seven hundred seventy-one million, six hundred fifty-six thousand, two hundred twelve".